8 - 10 8 - 10
MELSEC-GOT
8 ERROR CODES AND ERROR MESSAGES
(3) Error messages appearing due to faulty Q/QnACPU bus
connection and measure against errors
Cause and check point
Error
Code
Error
Messages
Check Timing
Error detail
Remedy
Corresponding
CPU
1310 I/O INT
ERROR.
During interrput
An imprecise interrupt occurs to the
PLC CPU.
QCPU
QnACPU
At CPU power ON/
At reset/When
intelligent function
module is
accessed.
There was no response from the
intelligent function module during initial
communications stage.
The size of the buffer memory of the
intelligent function module is
abnormal.
QCPU
1401
At CPU power ON/
At reset
At the time of initial communication, a
response is not returned from the
special function module (including the
GOT).
QnACPU
When an intelligent
function module
access instruction
is executed.
The intelligent function module was
accessed in the program, but there was
no response.
QCPU
1402
During execution of
FROM/TO
instruction set
The special function module was
accessed during the execution of a
FROM/TO instruction set, but there was
no response.
QnACPU
1403
SP. UNIT
DOWN
When an End
instruction is
executed
There was no response from the
intelligent function module when the
END instruction is executed.
An error is detected at the intelligent
function module.
(1) Check that the module and the
cables are connected correctly.
(2) Replace the faulty module and the
cables with new ones.
(3) Check that the PLC and the GOT
are earthed correctly.
(4) Check the number of extension
stages and the I/O slot numbers.
QCPU
1411
At CPU power ON
At the time of initial communication, an
imprecise response is returned from the
special function module (including the
GOT).
(1) Check that the module and the
cables are connected correctly.
(2) Because a faulty module cannot be
located, remove the modules one
by one until no CONTROL_BUS
ERR. message appears to indicate
the module where the error occurs.
(Because the modules are
removed, SP. UNIT ERR.
message may appear. Stop
transmitting the FROM/TO
instruction to the applicable
module.)
1412
CONTROL_
BUS ERR.
During execution of
FROM/TO
instruction set
When the FROM/TO instruction is
executed, an imprecise response is
returned from the special function
module (including the GOT).
Check the faulty module from the error
step.
(1) Check that the module and the
cables are connected correctly.
(2) Replace the faulty module with a
new one.
(3) Check that the PLC and the GOT
are earthed correctly.
QCPU
QnACPU
2000 UNIT
VERIFY
ERR.
When an End
instruction is
executed
The information stored in the cards of
the module installed in the base module
and the communication module of the
GOT is different from that read at the
initial time.
(If an error occurs on a module (vacant)
other than that installed in the base
module, the mis-operation may be
caused by noise.)
Check the faulty module at special
resisters SD1400 to SD1431.
(1) Check that the module and the
cables are connected correctly.
(2) Check that the PLC and the GOT
are earthed correctly.
QCPU
QnACPU
